Cho tam giác ABC vuông tại A, đường cao AH (HϵBC)

a) Biết AB = 12cm, BC = 20cm. Tính AC, B, AH (góc làm tròn đến độ)

b) Kẻ HE vuông góc AB (EϵAB). Chứng minh: AE.AB=AC²-HC²

c) Kẻ HF vuông góc AC (FϵAC). Chứng minh: AF=AE.tanC

Bài 3. Một con thuyền vượt qua một khúc sông nước chảy mạnh. Biết rằng đường đi của thuyền tạo với bờ một góc . Biết chiều rộng của khúc sông đó là 300m.

a) Tính quãng đường mà con thuyền đã đi.

b) Tính thời gian của con thuyền khi vượt qua khúc sông đó biết vận tốc của nó là 20m/phút ( kết quả làm tròn đến mét, phút) KO

Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

Question 32. She wishes she could cook meals as good as her sister. 

            A. wishes                    B. could cook                          C. good                       D. her             

Question 33. The children in my village used to going barefoot, even in winter. Now, they have shoes.

            A. The                         B. in                                        C. going                      D. shoes

Question 34. If she worked more carefully, she won’t make so many mistakes.

            A. more carefully        B. won’t make                         C. many                       D. mistakes

Mark the letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to the original sentence in each of the following questions.

Question 35. “I don’t buy this skirt here”, Hoa said.

A. Hoa said she didn’t buy that skirt there.                 

B. Hoa said I don’t buy this skirt there.

C. Hoa said she doesn’t buy that skirt there.                    

D. Hoa said she didn’t buy this skirt there.

Question 36. She has never tasted this kind of food before. 

A. She tasted this kind of food before.                             

B. This is the first time she has ever tasted this kind of food.

C. She has ever tastes this kind of food.

D. This is the last time she tasted this kind of food.

Question 37. Alexander Graham Bell invented the telephone.

A. The telephone was invented by Alexander Graham Bell.

B. The telephone invented by Alexander Graham Bell.

C. The telephone is invented by Alexander Graham Bell.

D. The telephone has been invented by Alexander Graham Bell.

Question 38. The old woman was too weak to lift the box. 

A. Although the old woman was weak, she could lift the box.

B. The old woman shouldn’t have lifted the box because she was so weak.

C. The old woman was so weak that she couldn’t lift the box.

D. The old woman lifted the box, so she wasn’t very weak.

Question 39. It’s very exciting to spend the weekend in the countryside.

A. To spend the weekend in the countryside is very excited.

B. Spend the weekend in the countryside is very exciting.

C. Spending the weekend in the countryside is very excited.

D. Spending the weekend in the countryside is very exciting.

Question 40. “If I were you, I would follow the teacher’s advice”, Linda said to Tom.

A. Linda said to Tom if she were him, she would follow the teacher’s advice.

B. Linda ordered Tom to follow the teacher’s advice.

C. Linda asked Tom to follow the teacher’s advice.

D. Linda advised Tom to follow the teacher’s advice.

Mark the letter A, B, C or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

Question 1. A. pleasure                     B. heat                        C. meat                       D. teacher

Question 2. A. nations                       B. brothers                  C. speakers                  D. parents

Mark the letter A, B, C or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions.

Question 3. A. become                      B. gather                     C. design                     D. invent  

Question 4. A. celebrate                    B. natural                    C. dangerous               D. emotion  

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

Question 5. They are living in a house that ______________ in 1930.

Question 6. She _________a letter when the telephone rang.

            A. wrote                      B. was writing             C. was written             D. has written

Question 7. It takes my daughter two hours _________her homework every day.

            A. to doing                  B. doing                      C. to do                       D. did

Question 8. My brother didn’t go to work _________his sickness.

            A. although                 B. because                   C. despite                    D. because of

Question 9. Your father has worked in the bank for 20 years, _________?

            A. has he                     B. does he                   C. hasn’t he                 D. doesn’t he

Question 10. The children felt ____________ when their mother was coming back home.

Question 11. Many English words have been _____ over the centuries. The ________of form makes English easy to learn.

Question 12. They never came to class late, and _______.

A. neither I did                       B. neither did I                        C. I did either              D. so did I

Question 13. This pen, _________is made of gold, was given to me by my father on my 12^th birthday. 

            A. that                         B. which                      C. who                        D. whose

Question 14.  The children danced _________at the party yesterday. 

            A. happy                     B. happiness                C. happier                   D. happily 

Question 15.  Nam played the guitar _________beautifully that we listened to him in admiration.

A. so                            B. such                        C. too                          D. enough

Mark the letter A, B, C or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.

Question 16. My sister has a good relationship with her colleagues, so every in her company loves her.

            A. gets on with            B. knows                     C. looks after              D. thinks about

Question 17. During the rush hour, the bus is always crowded with people.

            A. empty                     B. busy                        C. quiet                       D. packed

Mark the letter A, B, C or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.

Question 18. When you go into a pagoda, you should take off your shoes and hat.

            A. go on                      B. put on                     C. get on                      D. turn on

Question 19. You should not wear casual clothes to the interview. The first impression is very important.

            A. new                        B. informal                  C. neat                         D. formal

Mark the letter A, B, C or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges.

Question 20. Peter: “It’s very kind of you to help us. Thanks a lot, Daisy! – Daisy: “_________”

            A. How can I help you?                                  B. That’s right.

            C. It’s my pleasure!                                         D. Thanks!

Question 21. Robert: "Can I borrow your dictionary?" - Mary:" ________."

            A. I’m afraid I can’t                B. I think so    C. It doesn’t matter     D. Here you are

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.

The Eiffel Tower is a famous tower in Paris, France. It was named after the engineer who designed and built it, Alexandre Eiffel. The tower was built in 1889. At first, people didn’t like it because they thought it looked like a giant skeleton and was not attractive at all. Nevertheless, when the tower was finally completed, people quickly changed their minds. It looked like a tower made of lace and it was attractive.

The Eiffel Tower is sometimes considered one of the seven wonders of the modern world. It is 300 meters high and people can take an elevator all the way to the top. From the tower, they can get a marvelous view of the city and the Seine river which runs through it. Besides the elevator, there are steps which lead all the way up the tower. For those who are energetic, they can use these to climb up. It is very windy at the top of the tower and can be very cold at times because it is only built by iron beams. There are no walls to keep the wind out.

Question 22. The Eiffel Tower got its name _________.

            A. from its location                                         B. from its designer

            C. from Paris                                                   D. from people in Paris

Question 23. The word “it” in paragraph 2 refers to_________.

            A. the view                  B. the city                    C. the tower                D. the elevator

Question 24. Why did they change their minds in the end?

            A. It turned out to be very safe.                      B. They liked lace.

            C. It turned out to be beautiful.                       D. The design was changed.

Question 25. The word “marvelous” in paragraph 2 is closest in meaning to ___________.

            A. fantastic                 B. awful                      C. plain                        D. regular

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.

Nowadays, more and more people around the world are spending time (26) _________English as a second language. Many countries include English in their school syllabus and children start to learn English (27) _________a very early age.

Whether you are looking for a new job or planning to travel the world, studying English can help you (28) _________in life both personally and professionally. You can (29) _________in the global market, increase your career skills and start to meet people around the world.

It’s easy to see (30) _________important English is around the world. (31) _________international businesses conduct meetings in English, universities teach courses in English and around the globe, tourists and travellers use English as a common language.

Question 26. A. study                        B. studying                              C. to study                  D. studied

Question 27. A. in                              B. with                                    C. at                            D. of

Question 28. A. improve                    B. achieve                               C. begin                       D. win

Question 29. A. accomplish               B. complete                             C. compete                  D. enter

Question 30. A. how                          B. which                                  C. what                        D. if

Question 31. A. Much                        B. Many                                  C. A little                    D. Few

Mark the letter A, B, C, or D to indicate the most suitable response to complete each of the following exchanges.

17. - “Could you pass me the salt, please?” - “_______”

     A. Certainly, here you are.                             B. It can't be passed.

     C. The salt? Why's that?                                 D. No, I couldn't.

18. - “I was worried about chemistry, but Mr Brown gave me an A!”

     - “_______”

     A. Don't worry about it.

     B. Congratulations! That's a difficult course.

     C. Mr Brown is a very good teacher.

     D. Good luck to you!

Bài 1: Viết các PTHH biểu diễn hóa học sau (ghi điều kiện của phản ứng , nếu có)

1. KClO₃ → O₂ → P₂O₅ → H₃PO₄

2.KMnO₄ → O₂ → Na₂O → NaOH

3.Mg → H₂ → H₂O → H₂SO₄ → FeSO₄ → ZnSO₄

Bài 2: Hòa tan hoàn toàn a gam natri vào nước, sau phản ứng thu được dung dịch X và 4,48 lít khí hiđrô (đktc). Khô cạn dung dịch X thu được m gam chất rắn (khan)

a. tính giá trị của a và m 

b. dẫn toàn bộ lượng hiđrô sinh ra ở phản ứng trên đi qua sắt từ oxi dạng bột nóng . Sau khi kết thúc phản ứng thì đã có bao nhiêu gam sắt từ oxi đã bị khử và có bao nhiêu gam sắt tạo thành ?